Too many jyutping checkers

[graphemecluster]

現時粵拼會經過三重檢查，根本冇噉嘅需要：

• https://github.com/rime/rime-cantonese/blob/main/.ci/checker.cpp
• https://github.com/rime/rime-cantonese/blob/main/.ci/verify.php
• https://github.com/CanCLID/rime-cantonese-upstream/blob/main/scripts/validate.py

等所有詞表搬咗去上游，#167 搞掂之後，一於將呢度嘅兩個粵拼 checker delete 咗佢。